<template>
    <div class="app-container">
        <el-form label-width="120px"> 
            <el-form-item label="信息描述">
                <el-tag type="info">excel模版说明</el-tag> 
                <el-tag>
                    <i class="el-icon-download"/> 
                    <!-- <a :href="OSS_PATH + '/excel/%E8%AF%BE%E7%A8%8B%E5%88%86%E7%B1%BB%E5%88%97%E8%A1%A8%E6%A8%A1%E6%9D%BF.xls'">点击下载模版</a> -->
                    <a :href="'/static/课程分类.xlsx'">点击下载模版</a>
                </el-tag> 
            </el-form-item>
            <el-form-item label="选择Excel">
                <el-upload 
                    ref="upload"
                    :auto-upload="false"
                    :on-success="fileUploadSuccess" 
                    :on-error="fileUploadError"
                    :disabled="importBtnDisabled" 
                    :limit="1"
                    :action="BASE_API+'/eduservice/subject/addSubject'" 
                    name="file"
                    accept="application/vnd.ms-excel">
                    <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
                    <el-button
                        :loading="loading"
                        style="margin-left: 10px;" 
                        size="small"
                        type="success"
                        @click="submitUpload">{{ fileUploadBtnText }}</el-button> 
                </el-upload>
            </el-form-item> 
        </el-form>
    </div> 
</template>

<script> 
    export default {
        data() { 
            return {
                BASE_API: process.env.BASE_API, // 接口API地址 
                //OSS_PATH: process.env.OSS_PATH, // 阿里云OSS地址 
                fileUploadBtnText: '上传到服务器', // 按钮文字 
                importBtnDisabled: false, // 按钮是否禁用, 
                loading: false
            } 
        },
        created() {

        },
        methods: {
            // 点击按钮上传文件到接口的方法
            submitUpload() {
                this.fileUploadBtnText = '正在上传'
                this.importBtnDisabled = true
                this.loading = true
                // js : document.getElementById("upload").submit()
                this.$refs.upload.submit()
            },
            // 上传成功的方法
            fileUploadSuccess() {
                // 提示信息
                this.fileUploadBtnText = '上传成功'
                this.loading = false
                this.$message({
                    type: 'success',
                    message: '课程分类添加成功'
                })
                // 跳转到课程分类列表页面 （ 路由跳转 ）
                this.$router.push({path: '/subject/list'})
            },
            // 上传失败的方法
            fileUploadError() {
                // 提示信息
                this.fileUploadBtnText = '上传失败'
                this.loading = false
                this.$message({
                    type: 'error',
                    message: '课程分类添加失败'
                })
            }
        }
    }
</script>